return sprintf(buf, "0x%lx\n", mem->size);
}
+static ssize_t map_offset_show(struct uio_mem *mem, char *buf)
+{
+ return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK);
+}
+
struct uio_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct uio_mem *, char *);
__ATTR(addr, S_IRUGO, map_addr_show, NULL);
static struct uio_sysfs_entry size_attribute =
__ATTR(size, S_IRUGO, map_size_show, NULL);
+static struct uio_sysfs_entry offset_attribute =
+ __ATTR(offset, S_IRUGO, map_offset_show, NULL);
static struct attribute *attrs[] = {
&addr_attribute.attr,
&size_attribute.attr,
+ &offset_attribute.attr,
NULL, /* need to NULL terminate the list of attributes */
};
{
struct uio_device *idev = vma->vm_private_data;
struct page *page;
+ unsigned long offset;
int mi = uio_find_mem_index(vma);
if (mi < 0)
return VM_FAULT_SIGBUS;
+ /*
+ * We need to subtract mi because userspace uses offset = N*PAGE_SIZE
+ * to use mem[N].
+ */
+ offset = (vmf->pgoff - mi) << PAGE_SHIFT;
+
if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
- page = virt_to_page(idev->info->mem[mi].addr);
+ page = virt_to_page(idev->info->mem[mi].addr + offset);
else
- page = vmalloc_to_page((void*)idev->info->mem[mi].addr);
+ page = vmalloc_to_page((void *)idev->info->mem[mi].addr
+ + offset);
get_page(page);
vmf->page = page;
return 0;